There is grind boosting and dungeon boosting. Both use a high level main toon with linked RaF accounts.
Dungeon boosting is as described in this post, there are other posts on grind boosting but its basically just parking your alts in a specific place in the world while your high level toon kills everything.
While boosting you can't use the dungeon finder because the main is too high level. Running dungeons using 5 toons of appropiate level is much much much much much slower than boosting.
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